Reproductive Biology of Angiosperms — DU B.Sc. (Hons.) Botany Previous Year Question Papers

Attempt four questions in all, including Question 3. All parts of a question must be answered together. 5. Draw well-labelled diagrams and write the botanical names wherever necessary. 1. (a) ive inficant contribution of the ollowing Any two): (2×2.5=5) (b) Name the species/ plant in which the following occurs: (1x5=5) (a) Largest seed (b) Pseudo embryo sac (c) Smallest angiosperm flower (d) Cleistogamous flowers (c) Fill in the blanks: (1x5=5) (i) Pseudomonads are characteristic of family (Il) In Litchi, the edible part is (iii) Ruminate endosperm is found in (iv) in pollen germination. is responsible for crowding effect (v) Reproductive barriers can be overcome by intra-ovarian pollination in members of the family 2. Differentiate between the following (Any three): (i) Homomorphic and Heteromorphic Incompatibility (ii) Amoeboid and Secretory tapetum (iii) Monosporic and Tetrasporic embryo sac development (iv) Endothecium and endothelium (v) Ornithophily and Anemophily (a) Elaborate upon the significance of reproductive biology in the conservation of plants. (b) How is a seed designated as a storage organ? Explain with relevant examples. (c) Short-distance transport occurs in various embryological tissues. Comment. 4. Write short notes on the following (Any three): (i) Female Germ Unit (ii) NPC system (iii) Polyembryony (iv) Endosperm haustoria 5. Draw well-labelled diagrams of the following (any three): (5x3=15) (i) T.S. of a mature anther (ii) Bitegmic, anatropous ovule with Fritillaria type embryo sac (iii) Steps involved in the entry of pollen tube in the embryo sac (iv) Ultrastructure of Egg Cell 6. (a) Trace the development of a typical dicot embryo and elaborate on embryo patterning. (8) (b) What is a Male Germ Unit, and why is it important in double fertilization? (7)